PIC16F872-E/SS Microchip Technology, PIC16F872-E/SS Datasheet - Page 229

• Manufacturer Part Number: PIC16F872-E/SS
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,SSOP,28PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F872-E/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-SSOP
• Package: 28SSOP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 22
• Interface Type: I2C/SPI
• On-chip Adc: 5-chx10-bit
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15.3.3
1997 Microchip Technology Inc.
SPI Master SSPM3:SSPM0 = 00xxb
Typical Connection
MSb
PROCESSOR 1
Serial Input Buffer
Figure 15-2
(Processor 1) initiates the data transfer by sending the SCK signal. Data is shifted out of both
shift registers on their programmed clock edge, and latched on the edge of the clock specified by
the SMP bit. Both processors should be programmed to same Clock Polarity (CKP), then both
controllers would send and receive data at the same time. Whether the data is meaningful (or
dummy data) depends on the application software. This leads to three scenarios for data trans-
mission:
• Master sends data — Slave sends dummy data
• Master sends data — Slave sends data
• Master sends dummy data — Slave sends data
Figure 15-2:
Shift Register
(SSPBUF)
(SSPSR)
shows a typical connection between two microcontrollers. The master controller
LSb
SPI Master/Slave Connection
SDO
SCK
SDI
Serial Clock
SDO
SCK
SDI
Section 15. SSP
SPI Slave SSPM3:SSPM0 = 010xb
MSb
Serial Input Buffer
Shift Register
PROCESSOR 2
(SSPBUF)
(SSPSR)
DS31015A-page 15-9
LSb
15